Dream Thief
Creature — Faerie Rogue
Oracle Text
Flying When this creature enters, draw a card if you've cast another blue spell this turn.Rules for this card
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A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Rulings (2)
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Wizards of the CoastAlthough Dream Thief says it looks for "another blue spell," there's no requirement that Dream Thief actually be cast as a spell (or be blue) for this part of its ability to work. For example, if a spell such as Zombify puts Dream Thief directly onto the battlefield, its ability will still check whether you've cast a blue spell this turn, even though you didn't cast Dream Thief itself as a spell.
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Wizards of the CoastDream Thief doesn't check whether you've cast another blue spell until its "enters" ability resolves. If Dream Thief's "enters" ability triggers, then you cast a blue instant spell in response, you'll get the bonus.